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Plant guideAlocasia care: the complete guide
Guidance verified against current care guides (Bloomscape, The Plant Runner, Houseplant411, MyGreenScape) and the ASPCA and RHS toxicity listings as relayed by secondary sources, on 8 October 2026 and expanded on 16 October 2026 (soil, repotting, fertiliser). Figures were taken from search summaries of those pages, dated the same day. Sources linked below.
An alocasia (elephant ear) grows best in bright, indirect light, needs water when the top 1 to 2 inches of soil are dry and prefers 65 to 85°F (18 to 29°C) with humidity of 60% or more. It is a tropical foliage plant with arrow-shaped leaves that goes dormant in winter, and the ASPCA lists it as toxic to cats and dogs.
| Attribute | What an alocasia needs |
|---|---|
| Light | Bright, indirect light; direct sun scorches the leaves |
| Water | When the top 1 to 2 inches (2.5 to 5 cm) of soil are dry; never soggy |
| Humidity | 60% or more; dry air invites spider mites |
| Temperature | 65 to 85°F (18 to 29°C); avoid cold drafts and sudden swings |
| Winter | Many go dormant; less water, no fertiliser, keep warm |
| Main pest | Spider mites |
| Toxicity | Toxic to cats, dogs and horses (ASPCA), calcium oxalate crystals |
How much light does an alocasia need?
An alocasia needs bright, indirect light, such as a spot near a north or east-facing window. Direct sun burns the leaves, and too little light gives leggy growth and yellowing. Grow lights or a brighter position help the plant keep growing through winter. The light guide explains how to judge a spot.
How often should you water an alocasia?
Water an alocasia when the top 1 to 2 inches (2.5 to 5 cm) of soil are dry. Its roots are sensitive to sogginess, so use a pot with drainage holes and empty the saucer. Root rot is the main risk. The watering guide covers the finger test and root rot explains the damage from overwatering.
What humidity and temperature does an alocasia need?
An alocasia prefers humidity of 60% or more and a steady 65 to 85°F (18 to 29°C). A pebble tray, humidifier or a group of plants raises humidity. Keep it away from cold drafts, vents and sudden temperature changes. See the humidity guide and temperature guide.
Does an alocasia go dormant in winter?
Yes, many alocasias slow down in winter, and some varieties such as 'Tiny Dancer' shed their leaves. Dormancy is normal and not a sign the plant has died. Use the steps below.
| Step | What to do |
|---|---|
| Warmth | Move the pot to a warmer spot in the home |
| Water | Water less often, but do not let the mix dry out completely |
| Fertiliser | Stop feeding until spring |
| Foliage | Prune dead leaves |
| Restart | Growth typically resumes in spring |
Keeping light levels up, with a grow light or a brighter position, helps avoid dormancy altogether. See the fertilising guide for feeding in the growing season.
Why is my alocasia dropping or yellowing leaves?
An alocasia drops or yellows leaves because of watering errors, low light, cold or dormancy. Match the symptom below.
| Symptom | Likely cause | Fix |
|---|---|---|
| Yellow leaves, wet soil | Overwatering | Let the top 1 to 2 inches dry; check roots |
| Yellow leaves, dry soil | Underwatering | Water thoroughly, then keep to a routine |
| Pale, leggy growth | Too little light | Move to brighter, indirect light |
| Leaves dropping in autumn or winter | Dormancy | Cut back water, keep warm, wait for spring |
| Scorched patches | Direct sun | Move out of direct sun |
The yellow leaves guide and overwatering vs underwatering guide cover general diagnosis.
What soil does an alocasia need?
An alocasia needs a chunky, free-draining, aroid-style mix that holds some moisture. One published DIY recipe (Epic Gardening) uses equal parts potting soil, pumice or perlite, and orchid bark, coco coir or husk chips. Sources differ on retention: a commercial alocasia mix uses vermiculite, which keeps soil wet longer, while the DIY recipe favours drainage first. Pick the drainage-first mix if you tend to overwater. Always use a pot with drainage holes.
When and how do you repot an alocasia?
Repot an alocasia in spring, when roots show at the drainage holes, into a pot only slightly larger. Kings NZ advises a pot about 5 cm (2 inches) bigger; Promesse de Fleurs says 2 to 4 cm (1 to 1.5 inches). Sources tie repotting to root growth rather than a fixed schedule, and one lower-authority site quotes every 18 to 24 months as a rough guide. For a large plant, top-dress instead: remove 3 to 5 cm (1 to 2 inches) of surface soil and replace it with fresh, well-draining mix. See the repotting guide for the general method.
How often should you fertilise an alocasia?
Feed an alocasia once or twice a month in the growing season with a liquid houseplant fertiliser at half strength. Proven Winners gives this schedule and also allows a slow-release fertiliser. Stop feeding in winter dormancy, and wait at least four weeks after repotting before the first feed (Promesse de Fleurs). The fertilising guide explains how to read the label.
Do alocasias get spider mites?
Yes, spider mites are the most common alocasia pest. Look for tiny red mites or fine webbing on the leaf undersides. Good humidity deters them, and regular warm, soapy-water sprays help. For an infestation, use an ultra-fine insecticidal oil. The spider mites guide has the full treatment.
Is alocasia toxic to cats and dogs?
Yes. The ASPCA lists the genus Alocasia as toxic to cats, dogs and horses. Insoluble calcium oxalate crystals irritate the mouth, throat and stomach, causing drooling and trouble swallowing. The RHS also marks Alocasia x amazonica as toxic to pets. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if a pet chews it. The pet-safe plants list has non-toxic alternatives.
FAQ
- Why is my alocasia dropping leaves?
- Alocasias drop leaves from cold, dormancy, dry air or uneven watering. Check the temperature first: below 60°F (15°C) triggers shedding. If it is autumn or winter, the plant may be going dormant, so water less and wait for spring.
- How much light does an alocasia need?
- An alocasia needs bright, indirect light. Direct sun scorches the leaves, and too little light gives leggy growth and yellowing.
- How often should you water an alocasia?
- Water an alocasia when the top 1 to 2 inches (2.5 to 5 cm) of soil are dry. Keep it lightly moist, never soggy, and water less in winter without letting the mix dry out completely.
- Does an alocasia go dormant?
- Yes. Many alocasias slow down or lose leaves in winter. Keep the plant warm, cut back water and fertiliser, remove dead foliage and expect new growth in spring.
- Is alocasia toxic to cats and dogs?
- Yes. Alocasia contains insoluble calcium oxalate crystals that irritate the mouth, throat and stomach. The ASPCA lists the genus as toxic to cats, dogs and horses. Call your vet if a pet chews it.
- What soil does an alocasia need?
- An alocasia needs a chunky, free-draining aroid-style mix. A published recipe uses equal parts potting soil, pumice or perlite, and orchid bark or coco coir. Use a pot with drainage holes.
- When should you repot an alocasia?
- Repot an alocasia in spring when roots show at the drainage holes, into a pot only 2 to 5 cm (1 to 2 inches) larger. For a large plant, replace the top 3 to 5 cm (1 to 2 inches) of soil instead.
- How often should you fertilise an alocasia?
- Feed once or twice a month in the growing season with a liquid houseplant fertiliser at half strength. Stop in winter and wait four weeks after repotting.
Related guides
Sources
- Bloomscape, Alocasia Care
- The Plant Runner, Alocasia plant care guide
- Houseplant411, Alocasia how to grow
- MyGreenScape, How to care for Alocasia
- Epic Gardening, How and when to repot alocasia
- Proven Winners, Alocasia
- Kings NZ, Alocasia growing guide
- Promesse de Fleurs, Repotting an alocasia
- RHS, Alocasia x amazonica
- ASPCA, Toxic and non-toxic plants